SKILL(1)                        User Commands                       SKILL(1)

NAME         top

       skill, snice - send a signal or report process status

SYNOPSIS         top

       skill [signal] [options] expression
       snice [new priority] [options] expression

DESCRIPTION         top

       These tools are obsolete and unportable.  The command syntax is
       poorly defined.  Consider using the killall, pkill, and pgrep
       commands instead.

       The default signal for skill is TERM.  Use -l or -L to list available
       signals.  Particularly useful signals include HUP, INT, KILL, STOP,
       CONT, and 0.  Alternate signals may be specified in three ways: -9
       -SIGKILL -KILL.

       The default priority for snice is +4.  Priority numbers range from
       +20 (slowest) to -20 (fastest).  Negative priority numbers are
       restricted to administrative users.

OPTIONS         top

       -f, --fast
              Fast mode.  This option has not been implemented.

       -i, --interactive
              Interactive use.  You will be asked to approve each action.

       -l, --list
              List all signal names.

       -L, --table
              List all signal names in a nice table.

       -n, --no-action
              No action; perform a simulation of events that would occur but
              do not actually change the system.

       -v, --verbose
              Verbose; explain what is being done.

       -w, --warnings
              Enable warnings.  This option has not been implemented.

       -h, --help
              Display help text and exit.

       -V, --version
              Display version information.


       Selection criteria can be: terminal, user, pid, command.  The options
       below may be used to ensure correct interpretation.

       -t, --tty tty
              The next expression is a terminal (tty or pty).

       -u, --user user
              The next expression is a username.

       -p, --pid pid
              The next expression is a process ID number.

       -c, --command command
              The next expression is a command name.

       --ns pid
              Match the processes that belong to the same namespace as pid.

       --nslist ns,...
              list which namespaces will be considered for the --ns option.
              Available namespaces: ipc, mnt, net, pid, user, uts.

SIGNALS         top

       The behavior of signals is explained in signal(7) manual page.

EXAMPLES         top

       snice -c seti -c crack +7
              Slow down seti and crack commands.

       skill -KILL -t /dev/pts/*
              Kill users on PTY devices.

       skill -STOP -u viro -u lm -u davem
              Stop three users.

SEE ALSO         top

       kill(1), kill(2), killall(1), nice(1), pkill(1), renice(1), signal(7)

STANDARDS         top

       No standards apply.

AUTHOR         top

       Albert Cahalan ⟨⟩ wrote skill and snice in 1999 as
       a replacement for a non-free version.

REPORTING BUGS         top

       Please send bug reports to ⟨⟩

COLOPHON         top

       This page is part of the procps-ng (/proc filesystem utilities)
       project.  Information about the project can be found at 
       ⟨⟩.  If you have a bug report for
       this manual page, see 
       This page was obtained from the project's upstream Git repository 
       ⟨⟩ on 2017-03-13.  If you dis‐
       cover any rendering problems in this HTML version of the page, or you
       believe there is a better or more up-to-date source for the page, or
       you have corrections or improvements to the information in this
       COLOPHON (which is not part of the original manual page), send a mail

procps-ng                       October 2011                        SKILL(1)